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Fosil kecil baru  membantu rewrite evolusi  kepiting ,  akhir dunia laut Jurassic

Sebuah artikel baru menjelaskan larva kepiting 150 - juta - tahun  spesimen fosil dari Jerman selatan . Fosil tersebut memberikan bukti penting untuk memahami awal dari kepiting ....read more

Tiny new fossil
helps rewrite crab evolution, sheds lights on late Jurassic marine world

Date:

March 10, 2015

Source:

Natural History Museum
of Los Angeles County

Summary:

A new article
describes a 150-million-year-old crab larva fossil specimen from southern
Germany. The fossil provides critical evidence for understanding the early rise
of crabs.

...................

NHM curator co-authors
paper on 150-million-year-old fossilized crab larva, found in southern Germany

A paper in the journal Nature Communications (March 9,
2015) co-written by NHM Crustacea curator Dr. Jody Martin describes a
150-million-year-old crab larva fossil specimen from southern Germany. The new
fossil provides critical evidence for understanding the early rise of crabs.

Arthropods (they of a hard outer-skeleton, like crustaceans, spiders, and
insects) very often have larval phases that are completely different from the
adults -- such as caterpillars and butterflies. Allegedly, one of the reasons
crabs have been so successful is that their larval life habits (diet,
locomotion, etc.) are decoupled from their adult life habits.

Most ancient fossils display a suite of "primitive" features,
consistent with their early evolution and allowing them to be distinguished
from their modern descendants. But the fossil described in this paper, despite
its age, possesses a very modern morphology, indistinguishable from many crab
larvae living today. "It's amazing, but if we did not know this was a
150-million-year-old fossil, we might think that it came from today's
ocean," Dr. Martin said. "This came as quite a surprise to all of
us."

True crabs are the most successful group of decapod crustaceans, with about
7,000 living species known. This success is most likely coupled to their life
history which includes two specialized larval forms, zoea and megalopa. The new
fossil is of the latter larval type (the megalopa), and it is the first such
fossil ever reported.

True crabs as a group are comparably young, starting to diversify only
about 100 million years ago (mya), with a dramatic increase in species richness
beginning approximately 50 mya -- though the early evolution of crabs is still
very incompletely known.







Story Source:

The above story is based on materials provided by Natural
History Museum of Los Angeles County. Note: Materials may be edited for content
and length.







Journal Reference:

1.    Joachim T. Haug, Joel W. Martin, Carolin
Haug. A 150-million-year-old crab larva and its implications for the
early rise of brachyuran crabs. Nature Communications, 2015; 6:
6417 DOI: 10.1038/ncomms7417

http://www.sciencedaily.com/releases/2015/03/150310105218.htm

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